package cn.itcast.zt.example.atomic;

import cn.itcast.zt.annotation.ThreadSafe;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicLong;

@Slf4j
@ThreadSafe
public class AtomicExample2 {
    // 请求总数
    public static int clientTotal = 5000;

    // 同时并发执行的线程数
    public static int threadTotal =  200 ;

    public static AtomicLong count = new AtomicLong(0) ;

    public static void main(String[] args) throws Exception {
        ExecutorService service = Executors.newCachedThreadPool() ;
        final Semaphore semaphore = new Semaphore(threadTotal) ;
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal) ;

        for(int i = 0; i < clientTotal; i++){
            service.execute(()->{
                try {
                    semaphore.acquire();
                    add() ;
                    semaphore.release();
                } catch (InterruptedException e) {
                    log.error("exception", e);
                }
                countDownLatch.countDown();
            });
        }

        countDownLatch.await();
        service.shutdown();
        log.info("count:{}", count);
    }

    private static void add() {
        count.incrementAndGet();
        // count.getAndIncrement();
    }
}
